The availability of potable water on the land is depended on the natural cycle of evaporation, condensation and precipitation of sea water. This is dependent on various factors and in large areas there is scarcity of potable water. In this article, a Submerged Reverse Osmosis Plant (SROP) is described which has been worked out that provides a cheap source of potable water from sea water. Due to development of reverse osmosis membranes that can filter out salt molecules, it is possible to have potable water from sea water. However, this process requires high pressure sea water. In this plant, the high pressure sea water is derived from deep sea that makes the potable water cheap. An innovative mechanism is used to develop the high pressure sea water. The scaled model is under construction and working plant is planned in near future.